Q1. Which of the following statements about the normal probability distribution is most accurate? A) Sixty-eight percent of the area under the normal curve falls between 0 and +1 standard deviations above the mean. B) The normal curve is asymmetrical about its mean. C) Five percent of the normal curve probability falls more than outside two standard deviations from the mean.
Q2. Which of the following is least likely a probability distribution? A) Zeta Corp.: P(dividend increases) = 0.60, P(dividend decreases) = 0.30. B) Roll an irregular die: p(1) = p(2) = p(3) = p(4) = 0.2 and p(5) = p(6) = 0.1. C) Flip a coin: P(H) = P(T) = 0.5.
Q3. Which of the following statements about probability distributions is least accurate? A) A binomial probability distribution is an example of a continuous probability distribution. B) A discrete random variable is a variable that can assume only certain clearly separated values resulting from a count of some set of items. C) The skewness of a normal distribution is zero.
Q4. Which of the following statements about probability distributions is least accurate? A) A probability distribution is, by definition, normally distributed. B) In a binomial distribution each observation has only two possible outcomes that are mutually exclusive. C) A probability distribution includes a listing of all the possible outcomes of an experiment.
Q5. A probability distribution is least likely to: A) give the probability that the distribution is realistic. B) contain all the possible outcomes. C) have only non-negative probabilities.
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发表于 2009-1-9 10:13
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